JP6287426B2 - Plastic bottle - Google Patents

Description

  The present invention relates to a plastic bottle that mainly contains content liquids such as food and drink.

  Recently, plastic bottles have become common as bottles for storing liquid contents such as food and drink.

  Plastic bottles that contain such content liquids are required to be lightweight as a whole. Also, in general, after filling a plastic bottle with the content liquid, the specific gravity of the content liquid changes, or the content liquid absorbs oxygen present in the empty space of the plastic bottle, causing a phenomenon that the inside of the bottle is depressurized. Are known. However, when the plastic bottle is reduced in weight, the thickness of the plastic bottle is reduced. Therefore, when such decompression occurs, the plastic bottle is easily deformed.

JP 2002-193229 A JP 2003-285814 A

  On the other hand, a technique for absorbing the reduced pressure inside the plastic bottle by providing a reduced pressure absorption panel on the body of the plastic bottle is also known (Patent Document 1). However, when such a reduced pressure absorption panel is provided, there is a problem that the capacity of the plastic bottle is reduced by the size of the reduced pressure absorption panel.

  Moreover, although what has arrange | positioned the circumferential rib to the trunk | drum of a plastic bottle at equal intervals is known (patent document 2), when this plastic bottle is reduced in weight, absorbing the decompression inside a bottle fully is not carried out. difficult. On the other hand, it is conceivable to enlarge the circumferential rib, but in this case, the capacity of the plastic bottle may be reduced.

  The present invention has been made in consideration of such points, and even when the plastic bottle is reduced in weight, the plastic can secure its capacity and prevent deformation due to decompression inside the bottle. The purpose is to provide a bottle.

  The present invention is a plastic bottle, comprising a mouth, a shoulder connected to the mouth, a body connected to the shoulder, and a bottom connected to the body, the body is A plurality of horizontal grooves and a cylindrical surface provided between the horizontal grooves, and the body portion extends from directly below the shoulder portion to directly above the bottom portion, and the horizontal groove and the cylindrical surface. And the plurality of horizontal grooves include at least three kinds of horizontal grooves or at least three kinds of horizontal grooves having an opening angle. It is a plastic bottle.

  According to the present invention, the plurality of horizontal grooves include a first horizontal groove having a maximum depth, a second horizontal groove having an intermediate depth, and a third horizontal groove having a minimum depth. It is a plastic bottle characterized by including.

  The present invention is the plastic bottle characterized in that the opening angles of the first horizontal groove, the second horizontal groove, and the third horizontal groove are all the same.

  The present invention is the plastic bottle characterized in that an opening angle of the first horizontal groove, the second horizontal groove, and the third horizontal groove is 40 ° to 90 °.

  The present invention is characterized in that the second horizontal groove has a maximum opening angle, the first horizontal groove has an intermediate opening angle, and the third horizontal groove has a minimum opening angle. It is a plastic bottle.

  The present invention is the plastic bottle characterized in that an opening angle of the first horizontal groove, the second horizontal groove and the third horizontal groove is 45 ° to 150 °.

  The present invention is the plastic bottle characterized in that the plurality of cylindrical surfaces formed between the respective horizontal grooves have a uniform diameter from directly below the shoulder portion to immediately above the bottom portion.

  The present invention is the plastic bottle characterized in that the plurality of horizontal grooves are arranged asymmetrically with respect to a central portion in the vertical direction of the body portion.

  In the present invention, the plurality of horizontal grooves include a bottom surface formed of a flat surface in cross section, an inner curved surface connected to the bottom surface, a side surface connected to the inner curved surface and inclined with respect to the cylindrical surface, A plastic bottle characterized by the above.

  According to the present invention, the trunk portion has a structure in which horizontal grooves and cylindrical surfaces are alternately and repeatedly arranged from directly below the shoulder portion to immediately above the bottom portion, and the plurality of horizontal grooves have at least three types of depth. Horizontal grooves, or horizontal grooves with at least three kinds of opening angles. For this reason, even when the plastic bottle is reduced in weight, it is possible to secure the capacity and to prevent deformation due to decompression inside the bottle.

FIG. 1 is a front view showing a plastic bottle according to a first embodiment of the present invention. FIG. 2 is a bottom view showing the plastic bottle according to the first embodiment of the present invention. FIGS. 3A to 3C are vertical sectional views showing a first horizontal groove, a second horizontal groove, and a third horizontal groove of the body portion in the first embodiment of the present invention, respectively. FIGS. 4A to 4B are vertical sectional views showing horizontal grooves before and after decompressing the inside of the plastic bottle in the first embodiment of the present invention, respectively. FIG. 5 is a front view showing a plastic bottle according to a second embodiment of the present invention. FIGS. 6A to 6C are vertical sectional views showing a first horizontal groove, a second horizontal groove, and a third horizontal groove of the body portion in the second embodiment of the present invention, respectively. FIGS. 7A to 7B are vertical sectional views showing horizontal grooves before and after decompressing the inside of the plastic bottle, respectively, in the second embodiment of the present invention. FIG. 8 is a front view showing a plastic bottle as a comparative example. FIG. 9 is a bottom view showing a plastic bottle as a comparative example.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 to 4 are views showing a first embodiment of the present invention.

  First, the outline of the plastic bottle according to the present embodiment will be described with reference to FIGS. In the present specification, “upper” and “lower” refer to the upper side and the lower side in a state where the plastic bottle 10 is erected (FIG. 1), respectively.

  The plastic bottle 10 shown in FIGS. 1 to 3 is manufactured by preparing a preform obtained by injection molding and subjecting the preform to biaxial stretch blow molding. Such a plastic bottle 10 is a lightweight bottle having a volume of, for example, 450 ml to 650 ml.

  The plastic bottle 10 includes a mouth portion 11, a shoulder portion 12 coupled to the lower portion of the mouth portion 11, a trunk portion 20 coupled to the lower portion of the shoulder portion 12, and a bottom portion 30 coupled to the lower portion of the trunk portion 20. Yes.

  Of these, the mouth portion 11 includes an external screw 13, a turnip 16 located below the external screw 13, and a support ring 17 located below the turnover 16. A vent slot 14 is formed in the external screw 13 in parallel to the axis of the plastic bottle 10. The vent slot 14 uses a carbonated beverage as the content liquid to be filled in the plastic bottle 10 or if the content liquid rots and the internal pressure rises, the internal pressure is released when the cap is opened to prevent the cap from jumping. Play a role. Therefore, when the content liquid does not contain carbonic acid, such as water, the vent slot 14 is not necessarily provided.

  Moreover, the trunk | drum 20 has a cylindrical shape as a whole, and has the several horizontal direction groove | channels 22-24 and the cylindrical surface 25 provided between each horizontal direction groove | channels 22-24. The body portion 20 has a structure in which the horizontal grooves 22 to 24 and the cylindrical surface 25 are alternately and repeatedly arranged from directly below the shoulder portion 12 to immediately above the bottom portion 30. Thus, the trunk | drum 20 is comprised only from each horizontal direction groove | channel 22-24 and the cylindrical surface 25. FIG.

  The plurality of horizontal grooves 22 to 24 include at least three types of horizontal grooves. Specifically, the horizontal grooves 22 to 24 include a first horizontal groove 22 having a maximum depth, a second horizontal groove 23 having an intermediate depth, and a third horizontal groove having a minimum depth. Direction groove 24.

  Each of these horizontal grooves 22 to 24 extends over the entire circumference in the circumferential direction of the body portion 20, and the vertical width thereof is uniform over the entire circumference in the circumferential direction. Note that the first horizontal grooves 22 formed in the body 20 have the same shape, the second horizontal grooves 23 have the same shape, and the third horizontal grooves 24 are the same. It has a shape.

  In this case, the body 20 has a second horizontal groove 23, a third horizontal groove 24, a third horizontal groove 24, a third horizontal groove 24, and a second horizontal groove from the shoulder 12 side toward the bottom 30 side. 2 horizontal grooves 23, second horizontal grooves 23, second horizontal grooves 23, first horizontal grooves 22, first horizontal grooves 22, second horizontal grooves 23, and third horizontal grooves 24. It is formed in order.

  The first horizontal groove 22, the second horizontal groove 23, and the third horizontal groove 24 are disposed asymmetrically in the vertical direction (both in positional relationship and interval) with respect to the vertical center of the body portion 20 (both in positional relationship and interval). Yes.

  Of the horizontal grooves 22 to 24 formed in the trunk portion 20, the uppermost second horizontal groove 23 provided in the vicinity of the shoulder portion 12 is mainly relatively deformed in the trunk portion 20. It plays the role which raises the intensity | strength of the shoulder 12 periphery area | region which is an easy part.

  The three third horizontal grooves 24 located second to fourth from the top mainly increase the strength of the upper half region of the body portion 20 and prevent this portion from being recessed in the horizontal direction. To play a role. In addition, the three third horizontal grooves 24 also serve to absorb reduced pressure by contracting in the vertical direction. In addition, it is possible to prevent the capacity of the plastic bottle 10 from being reduced by making the depth of the third horizontal groove 24 not too large (for example, about the first horizontal groove 22 or the second horizontal groove 23). it can.

  The three second horizontal grooves 23 located at the fifth to seventh positions from above mainly play a role of increasing the strength around the central portion of the trunk portion 20 which is a portion that is easily deformed. In addition, the two second horizontal grooves 23 also serve to absorb reduced pressure by contracting in the vertical direction.

  The two first horizontal grooves 22 located at the eighth to ninth positions from above mainly exhibit the function of absorbing the reduced pressure by contracting in the vertical direction when the inside of the plastic bottle 10 is depressurized. Further, the two first horizontal grooves 22 also play a role of increasing the strength around the central portion of the trunk portion 20 which is a portion that is easily deformed.

  The second horizontal groove 23 located tenth from above mainly serves to increase the strength of the lower half of the body 20 and prevent this portion from being recessed in the horizontal direction. The second horizontal groove 23 also has a function of absorbing reduced pressure by contracting in the vertical direction.

  The lowermost third horizontal groove 24 provided in the vicinity of the bottom portion 30 mainly serves to increase the strength of the peripheral region of the bottom portion 30 that is a relatively easily deformable portion of the body portion 20.

  The plurality of cylindrical surfaces 25 formed between the horizontal grooves 22 to 24 all have a uniform diameter from just below the shoulder 12 to just above the bottom 30. Accordingly, when the plastic bottle 10 is stored sideways in the vending machine, the plastic bottle 10 can be brought into contact with another adjacent plastic bottle 10 in a wide area, thereby preventing the body portion 20 from being deformed in the vending machine. can do.

  On the other hand, as shown in FIG. 2, the bottom 30 has a circular recess 31 located in the center and radial ribs 32 extending radially from the recess 31. In FIG. 2, the number of the radial ribs 32 is seven, but is not limited thereto, and may be set in a range of, for example, five to eleven. By arranging the radial ribs 32 in this manner, the strength of the bottom portion 30 is increased, the bottom portion 30 is hardly deformed, and the grounding stability of the plastic bottle 10 is enhanced.

  Next, the shape of the horizontal grooves 22 to 24 will be further described with reference to FIGS. 3A is a vertical sectional view of the first horizontal groove 22, FIG. 3B is a vertical sectional view of the second horizontal groove 23, and FIG. 3 is a vertical sectional view of three horizontal grooves 24. FIG.

As shown in FIG. 3 (a), the first horizontal groove 22 has a maximum vertical width w _a with with the maximum depth d _a among a plurality of horizontal grooves 22-24 .

As shown in FIG. 3 (b), the second horizontal groove 23, the intermediate vertical width w _b together with the first horizontal groove 22 intermediate depth d _b of the third horizontal grooves 24 Have. The depth _{d b} of the second horizontal groove 23, it is preferably 20% to 90% of the depth _{d a} of the first horizontal groove 22. The vertical width w _b of the second horizontal groove 23 is preferably 20% to 90% of the vertical width w _a of the first horizontal groove 22.

As shown in FIG. 3 (c), the third horizontal groove 24 has a minimum vertical width w _c with having the minimum depth d _c in the plurality of horizontal grooves 22-24 . The depth d _c of the third horizontal groove 24 is preferably 5% to 70% of the depth d _a of the first horizontal groove 22. Further, the vertical width w _c of the third horizontal groove 24 is preferably 5% to 70% of the vertical width w _a of the first horizontal groove 22.

  As shown in FIGS. 3A to 3C, these horizontal grooves 22 to 24 include a bottom surface 41 formed of a flat surface perpendicular to each cross section, an inner curved surface 42 connected to the bottom surface 41, and an inner curved surface. 42 and a side surface 43 that is inclined with respect to the cylindrical surface 25, and an outer curved surface 44 that connects the side surface 43 and the cylindrical surface 25.

In this case, the vertical length L _x of the bottom 41 are all between the horizontal grooves 22-24 in the same. By all vertical length L _x of the bottom 41 were the same, totally averaging the stress at the side wall load, it is possible to maintain a more stable shape.

Further, the opening angles _Rx of the horizontal grooves 22 to 24 are all the same between the horizontal grooves 22 to 24. By making all the opening angles _Rx of the horizontal grooves 22 to 24 the same, it is difficult for local concentration of stress to occur during vertical load, and the load is applied uniformly, so that the rigidity of the entire container increases.

In addition, the opening angle _Rx of the horizontal grooves 22 to 24 refers to an angle formed by the upper and lower side surfaces 43 in the vertical cross section, as shown in FIGS. The opening angle _Rx of the horizontal grooves 22 to 24 may be a predetermined angle in a range of, for example, 40 ° to 90 ° (40 ° to 90 °; the same applies to other portions), and 55 ° to 65 More preferably, the predetermined angle is in the range of °. When the opening angle _Rx of the horizontal grooves 22 to 24 is in this range, the effect of being easily deformed in the vertical direction at the time of depressurization and having excellent strength at the time of vertical load and side wall load is obtained.

  Moreover, although the thickness of the plastic bottle 10 in the cylindrical surface 25 of the trunk | drum 20 is not limited to this, For example, it can be made thin about 50 micrometers-250 micrometers. Further, the weight of the plastic bottle 10 is not limited to this, but can be 10 g to 20 g. Thus, by reducing the thickness of the plastic bottle 10, the weight of the plastic bottle 10 can be reduced.

  Such a plastic bottle 10 can be produced by biaxially stretch blow molding a preform produced by injection molding a synthetic resin material. Note that it is preferable to use a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), or PEN (polyethylene naphthalate) as the material of the preform, that is, the plastic bottle 10.

  The plastic bottle 10 can also be formed as a multilayer molded bottle having two or more layers. That is, by extrusion molding or injection molding, for example, the intermediate layer has gas barrier properties and light shielding properties such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate). A multilayer bottle having gas barrier properties and light shielding properties may be formed by extrusion molding a preform composed of three or more layers as the resin (intermediate layer), and then blow molding. Such an intermediate layer is preferably provided in at least the body 20 of the plastic bottle 10. Further, it is preferable to provide an intermediate layer in the region of the bottom portion 30 excluding the central portion of the bottom portion 30. This is because this portion may cause delamination (delamination) when subjected to an impact such as a case dropping. In order to have gas barrier properties and light shielding properties, a blend bottle in which thermoplastic resins are blended may be formed as well as multilayers.

  Next, the operation of the present embodiment having such a configuration will be described.

  First, an empty plastic bottle 10 is prepared, and the plastic bottle 10 is filled with a content liquid such as a beverage. Subsequently, the mouth portion 11 is closed with a cap (not shown). After closing the plastic bottle 10, the specific gravity of the content liquid changes or the content liquid absorbs oxygen present in the empty space (head space) of the plastic bottle 10, so the inside of the plastic bottle 10 is decompressed. It becomes the state. When a negative pressure is generated inside the plastic bottle 10 as described above, a stress is generated toward the inside of the plastic bottle 10.

  On the other hand, in the present embodiment, a plurality of horizontal grooves 22 to 24 are formed in the body portion 20. These horizontal grooves 22 to 24 are respectively deformed in the vertical direction when the inside of the plastic bottle 10 is decompressed.

  That is, as shown in FIGS. 4A to 4B, when the inside of the plastic bottle 10 is decompressed, the horizontal grooves 22 to 24 are deformed so as to be compressed in the vertical direction. 4A is a vertical sectional view of the horizontal grooves 22 to 24 before the inside of the plastic bottle 10 is decompressed, and FIG. 4B is a horizontal view after the inside of the plastic bottle 10 is decompressed. It is a vertical sectional view of directional grooves 22-24.

When the inside of the plastic bottle 10 is depressurized (FIG. 4B), the opening angle _Ry of the horizontal grooves 22 to 24 is compared with the opening angle _Rx before being depressurized (FIG. 4A). (R _x > R _y ) In addition, the vertical width w _y of the horizontal grooves 22 to 24 is smaller than the vertical width w _x (w _a , w _b , w _c ) before being decompressed (w _x > w _y ). On the other hand, the length L _y of the bottom surface 41 of the horizontal grooves 22 to 24 hardly changes compared to the length L _x of the bottom surface 41 before being decompressed (FIG. 4A) (L _x = L _y ). .

  Since the horizontal grooves 22 to 24 are thus deformed in the vertical direction, the plastic bottle 10 is reduced in the height direction. As a result, the volume of the plastic bottle 10 is reduced as a whole, and the reduced pressure of the bottle can be absorbed. On the other hand, the plastic bottle 10 is not greatly deformed in appearance. Specifically, when the sealed plastic bottle 10 is filled with the contents and the filled contents are extracted by 2% of the capacity of the plastic bottle 10, the height of the body 20 may be reduced by 1% or more. preferable.

  Thereafter, the plastic bottle 10 filled with the content liquid is accommodated in the vending machine in a state of being turned sideways. In this case, since the trunk | drum 20 is reinforced by the horizontal direction grooves 22-24, it is prevented that a deformation | transformation arises in the trunk | drum 20 within a vending machine.

  Moreover, in this Embodiment, since the trunk | drum 20 is comprised only from each horizontal direction groove | channel 22-24 and the cylindrical surface 25, it is not necessary to provide a decompression absorption panel in the trunk | drum 20. For this reason, the capacity | capacitance of the plastic bottle 10 does not reduce significantly by a decompression absorption panel.

  In particular, according to the present embodiment, a plurality of horizontal grooves 22 to 24 having different depths are formed in the body portion 20. Accordingly, the strength of the easily deformable portion of the body portion 20 can be intensively increased, and the reduced pressure can be absorbed when the inside of the plastic bottle 10 is decompressed. Moreover, the capacity | capacitance of the plastic bottle 10 does not reduce significantly with provision of the horizontal direction grooves 22-24, and the capacity | capacitance can be ensured.

  In the present embodiment, the body 20 includes horizontal grooves 22 to 24 each having three types of depth. However, the present invention is not limited to this, and the body portion 20 may include at least three types of horizontal grooves, and may include four or more types of horizontal grooves.

  Next, specific examples of the present embodiment will be described.

(Example)
First, a plastic bottle 10 having a configuration shown in FIGS. 1 to 4 and having a capacity of 615 ml was produced.

  In this case, 18.3 g and 28 g of PET single-layer preforms were prepared by injection molding, and a plastic bottle 10 having a capacity of 615 ml was manufactured by biaxial stretching blow molding of the preform.

  The obtained plastic bottle 10 was filled with 600 ml of water and capped with a cap with a rubber stopper.

  Thereafter, using a syringe, the content water was extracted by 12.3 mL (2% of the volume), and the total height of the plastic bottle 10 was measured before and after the extraction, and compared (Table 1). In the table, the total height shrinkage (rate) indicates the amount (rate) of the total height shrunk before and after the water filled in the plastic bottle 10 is extracted.

  Moreover, the negative pressure minimum reach | attainment point was measured by extracting the water which is a content, with measuring the internal pressure of the plastic bottle 10 (Table 2). The minimum negative pressure reaching point is the pressure waveform in the bottle when the plastic bottle 10 is gradually depressurized from the atmospheric pressure (about 101 kPa) by extracting the water filled in the plastic bottle 10. The pressure confirmed as a peak. In general, when the negative pressure minimum point is reached, the plastic bottle 10 undergoes large deformations such as depression deformation, elliptical deformation, and bending deformation.

(Comparative example)
On the other hand, as a comparative example, a plastic bottle 10 having a capacity of 615 ml shown in FIGS. 8 and 9 was produced. The plastic bottle 100 shown in FIGS. 8 and 9 includes a mouth portion 111, a shoulder portion 112, a trunk portion 120, and a bottom portion 130, and the trunk portion 120 is separated from the upper half portion 121 and the lower half portion by a horizontal groove 123. It is divided into sections 122.

  Among these, the upper half 121 is provided with a plurality of circumferential grooves 135 extending along the entire circumference. The lower half 122 of the body 120 is provided with a columnar rib 137 extending in the vertical direction and a vacuum absorbing panel 136 formed between the columnar ribs 137 and extending in the vertical direction. Reinforcing ribs 124 extending in the circumferential direction are provided below the lower half 122 of the body 120.

  In this case, 18.3 g and 28 g of PET single-layer preforms were produced by injection molding, and a plastic bottle 100 having a capacity of 615 ml was produced by biaxial stretch blow molding of the preform.

  The obtained plastic bottle 100 was filled with 600 ml of water and capped with a cap with a rubber stopper.

  Thereafter, using a syringe, the content water was extracted by 12.3 mL (2% of the volume), and the total height of the plastic bottle 100 was measured before and after the extraction and compared (Table 1).

  Moreover, the negative pressure minimum reach | attainment point was measured by extracting the water which is a content, with measuring the internal pressure of the plastic bottle 100 (Table 2).

  As shown in Table 1, in the plastic bottle 10 of the example, it was found that the total height of the plastic bottle 10 was reduced by 1% or more when the content filled in the sealed container was extracted by 2% of the capacity. . On the other hand, in the plastic bottle 100 of the comparative example, when 2% of the content filled in the sealed container was extracted, the total height of the plastic bottle 10 was reduced by less than 1%.

  Further, as shown in Table 2, the plastic bottle 10 according to the example had a lower negative pressure minimum reaching point than the plastic bottle 100 according to the comparative example. That is, it has been confirmed that the plastic bottle 10 according to the example has a shape in which a large deformation (a depression deformation, an elliptical deformation, a bending deformation, etc.) hardly occurs even when the inside becomes a negative pressure.

  Thus, compared with the plastic bottle 100 according to the comparative example, the plastic bottle 10 according to the example was greatly reduced in the height direction without causing large deformation when the inside was decompressed. For this reason, it is considered that the volume of the plastic bottle 10 is reduced as a whole, and the reduced pressure can be absorbed.

  The above applies to both plastic bottles having a weight of 18.3 g and 28 g.

Second Embodiment Next, the configuration of a plastic bottle according to a second embodiment of the present invention will be described with reference to FIGS. The second embodiment shown in FIGS. 5 to 7 is different in that the body portion 20 includes a plurality of horizontal grooves 27 to 29 having at least three kinds of opening angles. This is substantially the same as the first embodiment. 5 to 7, the same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The plastic bottle 10A shown in FIG. 5 has a plurality of horizontal grooves 27 to 29 and a cylindrical surface 25 provided between the horizontal grooves 27 to 29. The body portion 20 has a structure in which the horizontal grooves 27 to 29 and the cylindrical surface 25 are alternately and repeatedly arranged from directly below the shoulder portion 12 to immediately above the bottom portion 30. Thus, the trunk | drum 20 is comprised only from each horizontal direction groove | channel 27-29 and the cylindrical surface 25. FIG.

  The plurality of horizontal grooves 27 to 29 include at least three types of horizontal grooves. Specifically, the horizontal grooves 27 to 29 include a first horizontal groove 27 having a maximum depth, a second horizontal groove 28 having an intermediate depth, and a third horizontal groove having a minimum depth. And a directional groove 29.

Further, the plurality of horizontal grooves 27 to 29 include at least three types of horizontal grooves with open angles. That is, of the horizontal grooves 27 to 29, the second horizontal groove 28 has a maximum opening angle _{R 2,} a first horizontal groove 27 has a opening angle _{R 1} of the intermediate, third horizontal grooves 29 have a minimum of opening angle R _3.

  Each of these horizontal grooves 27 to 29 extends along the entire circumference in the circumferential direction of the body portion 20, and the depth, the opening angle, and the width in the vertical direction are uniform over the entire circumference in the circumferential direction.

  In this case, the body 20 has a second horizontal groove 28, a third horizontal groove 29, a third horizontal groove 29, a third horizontal groove 29, a second horizontal groove 28 from the shoulder 12 side toward the bottom 30 side. 2 horizontal grooves 28, second horizontal grooves 28, second horizontal grooves 28, first horizontal grooves 27, first horizontal grooves 27, second horizontal grooves 28 and third horizontal grooves 29 in this order. Is formed.

  The first horizontal groove 27, the second horizontal groove 28, and the third horizontal groove 29 are arranged asymmetrically in the vertical direction (both in positional relationship and interval) with respect to the vertical central portion of the body portion 20 (both positional relationship and interval). Yes.

  Of the horizontal grooves 27 to 29 formed in the trunk portion 20, the second horizontal groove 28 located in the uppermost portion provided in the vicinity of the shoulder portion 12 is mainly relatively deformed in the trunk portion 20. It plays the role which raises the intensity | strength of the shoulder 12 periphery area | region which is an easy part.

  The three third horizontal grooves 29 located from the second to the fourth from the top mainly increase the strength of the upper half region of the body portion 20 and prevent this portion from being recessed in the horizontal direction. To play a role. In addition, the three third horizontal grooves 29 supplementarily exhibit a function of absorbing the reduced pressure by contracting in the vertical direction. In addition, it is possible to prevent the capacity of the plastic bottle 10 </ b> A from being reduced by making the depth of the third horizontal groove 29 not too large (for example, about the first horizontal groove 27 or the second horizontal groove 28). it can.

  The three second horizontal grooves 28 located at the fifth to seventh positions from above mainly play a role of increasing the strength around the central portion of the trunk portion 20 which is a portion that is easily deformed. Further, the two second horizontal grooves 28 also serve to absorb reduced pressure by contracting in the vertical direction.

  The two first horizontal grooves 27 located at the eighth to ninth positions from above mainly function to absorb the reduced pressure by contracting in the vertical direction when the inside of the plastic bottle 10A is depressurized. Further, the two first horizontal grooves 27 also play a role of increasing the strength around the central portion of the trunk portion 20 which is a portion that is easily deformed.

  The second horizontal groove 28 located tenth from above mainly serves to increase the strength of the lower half of the body portion 20 and prevent this portion from being recessed in the horizontal direction. The second horizontal groove 28 also has a function of absorbing reduced pressure by contracting in the vertical direction.

  The lowermost third horizontal groove 29 provided in the vicinity of the bottom portion 30 mainly serves to increase the strength of the peripheral region of the bottom portion 30 which is a relatively easily deformable portion of the body portion 20.

  Next, the shapes of the horizontal grooves 27 to 29 will be further described with reference to FIGS. 6A is a vertical sectional view of the first horizontal groove 27, FIG. 6B is a vertical sectional view of the second horizontal groove 28, and FIG. 3 is a vertical sectional view of three horizontal grooves 29. FIG.

As shown in FIG. 6 (a), the first horizontal groove 27, the largest and second horizontal groove 28 along with having a depth d _a third horizontal grooves in a plurality of horizontal grooves 27-29 29 has an intermediate vertical width w _a . The first horizontal groove 27 has an intermediate opening angle R ₁ between the second horizontal groove 28 and the third horizontal groove 29.

As shown in FIG. 6 (b), the second horizontal groove 28, the maximum vertical width w _b together with the first horizontal groove 27 intermediate depth d _b of the third horizontal grooves 29 Have. The second horizontal groove 28 has the maximum opening angle R ₂ among the plurality of horizontal grooves 27 to 29. The depth _{d b} of the second horizontal groove 28 is preferably 20% to 90% of the depth _{d a} of the first horizontal groove 27. The vertical width w _b of the second horizontal groove 28 is preferably 100% to 200% of the vertical width w _a of the first horizontal groove 27.

As shown in FIG. 6 (c), the third horizontal groove 29 has a minimum vertical width w _c with having the minimum depth d _c in the plurality of horizontal grooves 27-29 . The third horizontal groove 29 has the smallest opening angle R ₃ among the plurality of horizontal grooves 27 to 29. The depth _{d c} of the third horizontal groove 29 is preferably 5% to 70% of the depth _{d a} of the first horizontal groove 27. The vertical width w _c of the third horizontal groove 29 is preferably 30% to 100% of the vertical width w _a of the first horizontal groove 27.

  As shown in FIGS. 6A to 6C, these horizontal grooves 27 to 29 include a bottom surface 41 formed of a flat surface perpendicular to the cross section, an inner curved surface 42 connected to the bottom surface 41, and an inner curved surface 42. And a side surface 43 that is inclined with respect to the cylindrical surface 25, and an outer curved surface 44 that connects the side surface 43 and the cylindrical surface 25.

In this case, the vertical length L _x of the bottom 41 are all between the horizontal grooves 27 to 29 are the same. By all vertical length L _x of the bottom 41 were the same, totally averaging the stress at the side wall load, it is possible to maintain a more stable shape.

The opening angles R _{1 to} R ₃ of the horizontal grooves 27 to 29 are preferably 45 ° to 150 °. Specifically, the opening angle R ₁ of the first horizontal groove 27 is preferably, for example, a predetermined angle in the range of 55 ° to 65 °. Opening angle R ₂ of the second horizontal groove 28, for example preferably in a predetermined angular range of 70 ° to 150 DEG °, more preferably it is predetermined angular range of 70 ° ~130 °. Moreover, opening angle R ₃ of the third horizontal groove 29 is preferably, for example, a predetermined angle in the range of 45 ° to 55 °. When the opening angles R _{1 to} R ₃ of the horizontal grooves 27 to 29 are in this range, the effect of being easy to deform in the vertical direction at the time of decompression and having excellent strength at the time of vertical load and side wall load is obtained. .

  In the plastic bottle 10A according to the present embodiment, the horizontal grooves 27 to 29 are respectively deformed in the vertical direction when the inside of the plastic bottle 10A is decompressed.

  That is, as shown in FIGS. 7A to 7B, the horizontal grooves 27 to 29 are deformed so as to be compressed in the vertical direction. 7A is a vertical sectional view of the horizontal grooves 27 to 29 before the inside of the plastic bottle 10A is decompressed, and FIG. 7B is a horizontal view after the inside of the plastic bottle 10A is decompressed. It is a vertical sectional view of directional grooves 27-29.

When the inside of the plastic bottle 10A is decompressed (FIG. 7B), the opening angle R _y of the horizontal grooves 27 to 29 is the opening angle R _x (R ₁ ) before being decompressed (FIG. 7A). ˜R ₃ ) (R _x > R _y ). In addition, the vertical width w _y of the horizontal grooves 27 to 29 is smaller than the vertical width w _x (w _a , w _b , w _c ) before being decompressed (w _x > w _y ). On the other hand, the length L _y of the bottom surface 41 of the horizontal grooves 27 to 29 hardly changes (L _x = L _y ) compared with the length L _x of the bottom surface 41 before being decompressed (FIG. 7A). .

  Since the horizontal grooves 27 to 29 are thus deformed in the vertical direction, the plastic bottle 10A is reduced in the height direction. As a result, the volume of the plastic bottle 10A is reduced as a whole, and the reduced pressure of the bottle can be absorbed. On the other hand, the plastic bottle 10A is not greatly deformed in appearance. Specifically, when the sealed plastic bottle 10A is filled with the contents, and the filled contents are extracted by 2% of the capacity of the plastic bottle 10A, the height of the body 20 may be reduced by 1% or more. preferable.

  In particular, according to the present embodiment, a plurality of horizontal grooves 27 to 29 having different depths are formed in the body portion 20. Thus, the strength of the easily deformable portion of the body portion 20 can be intensively increased, and the reduced pressure can be absorbed when the inside of the plastic bottle 10A is decompressed. Moreover, the capacity | capacitance of the plastic bottle 10 does not reduce significantly with provision of the horizontal direction grooves 27-29, and the capacity | capacitance can be ensured.

  In the present embodiment, the body 20 includes horizontal grooves 27 to 29 having three types of depths and three types of opening angles. However, not limited to this, the horizontal grooves 27 to 29 may all have the same depth, and may have at least three types of opening angles. In other words, in the present embodiment, the body portion 20 only needs to include at least three types of horizontal grooves with open angles. For example, the body 20 may include horizontal grooves each having four or more types of opening angles.

DESCRIPTION OF SYMBOLS 10 Plastic bottle 11 Mouth part 12 Shoulder part 20 Body part 22 1st horizontal direction groove | channel 23 2nd horizontal direction groove | channel 24 3rd horizontal direction groove | channel 25 Cylindrical surface 27 1st horizontal direction groove | channel 28 2nd horizontal direction groove | channel 29 3rd horizontal direction Groove 30 Bottom 31 Recess 32 Radial rib

Claims (5)

In plastic bottles,
The mouth,
A shoulder connected to the mouth;
A trunk connected to the shoulder;
A bottom connected to the body,
The trunk includes a plurality of horizontal grooves and a cylindrical surface provided between the horizontal grooves,
The trunk portion has a structure in which the horizontal groove and the cylindrical surface are alternately and repeatedly arranged from directly below the shoulder portion to immediately above the bottom portion,
It said plurality of horizontal grooves, viewed contains a horizontal groove of at least three different depths,
The plurality of horizontal grooves include a first horizontal groove having a maximum depth, a second horizontal groove having an intermediate depth, and a third horizontal groove having a minimum depth;
The opening angles of the first horizontal groove, the second horizontal groove and the third horizontal groove are all the same,
An opening angle of the first horizontal groove, the second horizontal groove, and the third horizontal groove is 40 ° to 90 ° . In plastic bottles,
The mouth,
A shoulder connected to the mouth;
A trunk connected to the shoulder;
A bottom connected to the body,
The trunk includes a plurality of horizontal grooves and a cylindrical surface provided between the horizontal grooves,
The trunk portion has a structure in which the horizontal groove and the cylindrical surface are alternately and repeatedly arranged from directly below the shoulder portion to immediately above the bottom portion,
The plurality of horizontal grooves include horizontal grooves having at least three kinds of depths, and at least three kinds of horizontal grooves having opening angles.
The plurality of horizontal grooves include a first horizontal groove having a maximum depth, a second horizontal groove having an intermediate depth, and a third horizontal groove having a minimum depth;
The second horizontal groove has a maximum opening angle, the first horizontal groove has an intermediate opening angle, and the third horizontal groove has a minimum opening angle;
The first horizontal groove, the second horizontal groove and the opening angle of the third horizontal grooves, features and to pulp las tic bottles that it is 45 ° ~150 °. 3. The plastic bottle according to claim 1, wherein the plurality of cylindrical surfaces formed between the horizontal grooves have a uniform diameter from directly below the shoulder portion to immediately above the bottom portion. The plastic bottle according to any one of claims 1 to 3 , wherein the plurality of horizontal grooves are arranged asymmetrically with respect to a central portion in the vertical direction of the trunk portion. The plurality of horizontal grooves include a bottom surface formed of a flat surface in cross section, an inner curved surface connected to the bottom surface, a side surface connected to the inner curved surface and inclined with respect to the cylindrical surface, the side surface, and the side surface The plastic bottle according to any one of claims 1 to 4 , further comprising an outer curved surface connecting the cylindrical surface.

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